Revealing mistake: In the scene where Doc Brown is following Biff into the tunnel, as Marty starts to pass between the cars on his hoverboard, one of the wheels on the rig supporting the hovering DeLorean is visible. (01:30:30)
Back to the Future Part II (1989)
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Directed by: Robert Zemeckis
Starring: Christopher Lloyd, Michael J. Fox, Lea Thompson, Thomas F. Wilson, Elizabeth Shue
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More mistakes in Back to the Future Part II
Biff: Oh! Nice dress, Lorraine. Although, I think you'd look better wearing nothing at all.
Lorraine: Biff, why don't you take a long walk off a short pier?
Biff: Hey listen, Lorraine. Now that I got my car all fixed up I figured I cut you a break and give you the honor of going with the best looking guy in school.
Lorraine: Yeah, well, I'm busy.
Biff: Oh, yeah? Doing what?
Lorraine: Washing my hair.
Biff: Oh, that's about as funny as a screen door on a battleship.
Marty: Screen door on a submarine, you dork.
Trivia: In an interview, the director stated that hoverboards were real, but they weren't on the market because parents didn't like the idea of floating children. He said this as a joke, but this didn't stop mass hysteria as thousands of kids went from store to store looking for hoverboards.
Question: In the alternate 1985, there is an alternate Biff, Lorraine etc. Shouldn't there also be an alternate Marty and Doc?
Answer: Doc would most likely not have been seen by anyone, as the time he spent in the alternate 1985 was primarily inside the DeLorean, at a boarded-up library, graveyard, and his lab (and all at night too) so most likely not spotted by the public.
Even if someone had seen Doc, it could've been dismissed as someone who looks like him. Even if they did report his escape, someone would either call or go to the asylum and verify Doc was still there.
I also don't think that Doc Brown ever achieved celebrity status prior to his being committed, so how would the average person even recognize him as some obscure scientist who was put away?
Answer: Yep, and there is, but they're both elsewhere. Doc's been committed to an asylum somewhere. When Marty first meets the alternate Biff, Biff tells him that he's supposed to be in Switzerland at boarding school - that's where the alternate Marty is.
Tailkinker ★
Wouldn't someone probably see Doc and report that he escaped from the asylum?
Maybe, but no way to be sure, and they're not around long enough for that to be an issue anyway.
Jon Sandys ★
That's why he stayed hidden most of the time (such as in the abandoned lab).